For the sweet and sour runner beans, wash and halve the runner beans or cut them into bite-sized pieces. Bring 1.5 liters of water with salt to a boil and blanch the green beans in batches for about five minutes. Drain and put them into properly cleaned preserving jars.
For the infusion, bring vinegar to a boil with half a liter of water, sugar, cinnamon sticks and cloves, simmer on low heat for a bit, remove from heat and stir in the preserving aid.
Pour the infusion over the runner beans and tightly close the jars with the sweet and sour runner beans.